Why we don't need to defrag UNIX FS? Post: 302451167

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Special Forums Hardware Filesystems, Disks and Memory Why we don't need to defrag UNIX FS? Post 302451167 by amro1 on Monday 6th of September 2010 01:38:05 AM

09-06-2010

Banned

Here...

Dear Corona688, you confuse binary tree algorithm for file seeking with an actual allocation i-nodes on physical drive. The gaps that left after removal of files and filled with parts of other files cause the fragmentation. When file open for reading, it goes through the chain and as parts of the file allocated in the areas that are not compactly located, the drive has to performs extra spins in order for perpendicularly moving heads to be on-time for reading/writing in the area. Along with disks' interleaving functionality it makes drive access very slow. That is exactly what fragmentation is. "shake" is one of many options available, again it is not universal and it is not capable of performing defragnetation on all kinds of file system used in UNIX land. "dump"-"restore" is a standard universal way of dealing with the problem, for enterprise level systems, at least for last 20 years.

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LEARN ABOUT SUSE

ntfsfix

NTFSFIX(8)						      System Manager's Manual							NTFSFIX(8)

NAME

       ntfsfix - fix common errors and force Windows to check NTFS

SYNOPSIS

       ntfsfix [options] device

DESCRIPTION

       ntfsfix is a utility that fixes some common NTFS problems.  ntfsfix is NOT a Linux version of chkdsk. It only repairs some fundamental NTFS
       inconsistencies, resets the NTFS journal file and schedules an NTFS consistency check for the first boot into Windows.

       You may run ntfsfix on an NTFS volume if you think it was damaged by Windows or some other way and it can't be mounted.

OPTIONS

       Below is a summary of all the options that ntfsfix accepts.  Nearly all options have two equivalent names.  The short name is preceded by -
       and  the  long name is preceded by --.  Any single letter options, that don't take an argument, can be combined into a single command, e.g.
       -fv is equivalent to -f -v.  Long named options can be abbreviated to any unique prefix of their name.

       -h, --help
	      Show a list of options with a brief description of each one.

       -V, --version
	      Show the version number, copyright and license

BUGS

       There are no known problems with ntfsfix.  If you find a bug please send an email describing the problem to the development team:
       linux-ntfs-dev@lists.sourceforge.net

AUTHORS

       ntfsfix was written by Anton Altaparmakov, with contributions from Szabolcs Szakacsits.

AVAILABILITY

       ntfsfix is part of the ntfsprogs package and is available from:
       http://www.linux-ntfs.org/content/view/19/37

       The manual pages are available online at:
       http://man.linux-ntfs.org/

SEE ALSO

       mkntfs(8), ntfsprogs(8)

ntfsprogs 1.13.1						   January 2006 							NTFSFIX(8)